Difference between revisions of "User:Pedro Oval/GIMP Layers to SL Animated Texture"

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(Added reading of the layer name to process Combine-mode layers; it should process all kinds of GIFs now without the need for Unoptimize.)
(Main updated to 2.0; no news here)
 
(One intermediate revision by the same user not shown)
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== Development version ==
== Development version ==


<scheme>
No changes with respect to the [[GIMP Layers to SL Animated Texture|stable version]] yet.
; Layers to SL Texture Animation, version 2.0pre2
;
; Written by Pedro Oval, 2010-12-04.
; Donated to the public domain.
; Thanks to Digital Dharma for the suggestions.
 
(define (script-fu-layers-to-sl-anim curimg curdrawable xframes yframes showscript fps)
 
  ; Local function: check if a string contains a substring
  (define (contains-ci str substr)
    (define i 0)
    (define lensub (string-length substr))
    (define imax (- (string-length str) lensub))
    (if (negative? imax)
      #f
      (begin
        (define found #f)
        (while (and (not found) (<= i imax))
          ; We make a case-insensitive comparison.
          (if (string-ci=? (substring str i (+ i lensub)) substr)
            (set! found #t)
            (set! i (+ i 1))))
        found)))
 
  ; Read the layer IDs and the total number of layers from the original image.
  (define layerset (gimp-image-get-layers curimg))
  (define numframes (car layerset))
  (set! layerset (cadr layerset))
 
  ; The frame size X and Y is the size of the original image.
  (define framesizex (car (gimp-image-width curimg)))
  (define framesizey (car (gimp-image-height curimg)))
 
  ; Get the image type; indexed images need special treatment.
  (define imgtype (car (gimp-image-base-type curimg)))
 
  ; Check if the given number of horizontal x vertical frames matches
  ; the number of layers in the original image. If yes, proceed; if not,
  ; show an error message.
  (if (= numframes (* xframes yframes))
    (begin
      ; New image
      (define img (car (gimp-image-new (* framesizex xframes) (* framesizey yframes) imgtype)))
      ; We don't touch the original image, so we start a new undo group
      ; for the new image instead.
      (gimp-image-undo-group-start img)
 
      (if (= imgtype INDEXED)
        (begin
          ; Indexed images need the palette to be copied to the new image.
          (define palette (gimp-image-get-colormap curimg))
          (gimp-image-set-colormap img (car palette) (cadr palette))))
 
      ; Initialize previous layer info to 0, as there's no previous layer yet.
      (define prevlayerinfo 0)
 
      ; Loop betwen 0 and numframes - 1.
      (define frame 0)
      (while (< frame numframes)
        ; For each layer/frame:
        (begin
 
          ; Show progress as the current frame relative to the number of frames.
          (gimp-progress-update (/ frame numframes))
 
          ; Read the individual layer ID, starting from the bottom.
          (define oldlayer (vector-ref layerset (- numframes frame 1)))
 
          ; Create new layer as a copy of this one and add it to the image.
          (define newlayer (car (gimp-layer-new-from-drawable oldlayer img)))
          (gimp-image-add-layer img newlayer -1)
 
          ; Add alpha if the layer doesn't have it.
          (if (= (car (gimp-drawable-has-alpha newlayer)) FALSE)
            (gimp-layer-add-alpha newlayer))
 
          ; Calculate the offsets and crop size.
          (define offsets (gimp-drawable-offsets oldlayer))
          (define newsizex (car (gimp-drawable-width oldlayer)))
          (define newsizey (car (gimp-drawable-height oldlayer)))
          (define offsetx (car offsets))
          (define offsety (cadr offsets))
          (if (< offsetx 0)
            (begin
              (set! newsizex (+ newsizex offsetx))
              (set! offsetx 0)))
          (if (< offsety 0)
            (begin
              (set! newsizey (+ newsizey offsety))
              (set! offsety 0)))
          (if (> (+ offsetx newsizex) framesizex)
            (set! newsizex (- framesizex offsetx)))
          (if (> (+ offsety newsizey) framesizey)
            (set! newsizey (- framesizey offsety)))
 
          ; Calculate frame position X and Y.
          (define framey (truncate (/ frame xframes)))
          (define framex (- frame (* framey xframes)))
          (set! framex (* framex framesizex))
          (set! framey (* framey framesizey))
 
          ; Resize and place the layer.
          (gimp-layer-resize newlayer
                            newsizex
                            newsizey
                            (- (car offsets) offsetx)
                            (- (cadr offsets) offsety))
          (gimp-layer-set-offsets newlayer (+ framex offsetx) (+ framey offsety))
 
          ; Force it visible.
          (gimp-drawable-set-visible newlayer TRUE)
 
          ; Check for (combine) mode. Note: It just works
          ; in layers other than 0. Otherwise no action is
          ; done. It makes no sense for the bottom layer to
          ; use combine mode anyway.
          (if (and (> frame 0) (contains-ci (car (gimp-drawable-get-name oldlayer)) "(combine)"))
            (begin
              ; Duplicate the previous layer to serve as a base
              ; for the differencing frame being added.
              (define layercopy (car (gimp-layer-new-from-drawable (car prevlayerinfo) img)))
 
              ; Add the new layer below the last layer.
              (gimp-image-add-layer img layercopy 1)
 
              ; Set the layer position to match that of the new layer.
              (gimp-layer-set-offsets layercopy (+ framex (cadr prevlayerinfo))
                                                (+ framey (caddr prevlayerinfo)))
 
              ; Ensure the previous layer's copy is visible.
              (gimp-drawable-set-visible layercopy TRUE)
 
              ; Merge the differencing frame into the previous layer's copy.
              (set! newlayer (car (gimp-image-merge-down img newlayer EXPAND-AS-NECESSARY)))
 
              ; Correct the offsets. We use 'min' to match what
              ; EXPAND-AS-NECESSARY has supposedly done. Ideally
              ; we should read the new offsets and subtract
              ; framex/framey from them, but this is faster and simpler,
              (set! offsetx (min offsetx (cadr prevlayerinfo)))
              (set! offsety (min offsety (caddr prevlayerinfo)))))
 
          ; Previous layer = this.
          (set! prevlayerinfo (list newlayer offsetx offsety))
 
          ; All done. Next loop iteration.
          (set! frame (+ frame 1))))
 
      ; Progress 100%
      (gimp-progress-update 1.0)
 
      ; Merge visible layers (all are visible now).
      (define mergedlayer (car (gimp-image-merge-visible-layers img CLIP-TO-IMAGE)))
 
      ; Make the new layer the size of the image.
      (gimp-layer-resize-to-image-size mergedlayer)
 
      ; Convert the image to RGB if it is not already.
      (if (not (= imgtype RGB))
        (gimp-image-convert-rgb img))
 
      ; Detect alpha by converting it to a selection.
      (gimp-selection-layer-alpha mergedlayer)
 
      ; If there is no useful alpha, the selection should cover the whole image.
      ; Invert it, and if it becomes empty, then it means that alpha was not
      ; in use: the whole image was covered with 100% opacity.
      (gimp-selection-invert img)
      (define hasalpha (car (gimp-selection-bounds img)))
      (gimp-selection-none img)
 
      ; If it didn't have any alpha, remove the alpha mask from the layer.
      (if (= hasalpha FALSE)
        (gimp-layer-flatten mergedlayer))
 
      ; All done - close the undo group and add a display window for the new image.
      (gimp-image-undo-group-end img)
      (gimp-display-new img)
 
      ; Show the script if requested
      (if (= showscript TRUE)
        (gimp-message (string-append "Copy-paste the following fragment as a script:\n\n"
                                    "default\n{\n    state_entry()\n    {\n"
                                    "        llSetTextureAnim(ANIM_ON | LOOP, "
                                    (number->string xframes)
                                    ", "
                                    (number->string yframes)
                                    ", 0.0, "
                                    (number->string (* xframes yframes))
                                    ".0, "
                                    (number->string fps)
                                    ");\n    }\n}\n"))))
 
    ; If the frame counts didn't match...
    (gimp-message "Error: Number of layers doesn't match horizontal x vertical frames")))
 
; Register the function.
(script-fu-register "script-fu-layers-to-sl-anim"
                    _"<Image>/Script-Fu/SecondLife/Frames to texture..."
                    _"Convert a set of layers (frames) to a texture suitable for llSetTextureAnim."
                    "Pedro Oval"
                    _"Public Domain"
                    "2010-12-04"
                    "RGB*, GRAY*, INDEXED*"
                    SF-IMAGE        "Image"        0
                    SF-DRAWABLE    "Drawable"    0
                    SF-ADJUSTMENT  _"# of horizontal frames" '(2 1 1024 1 10 0 1)
                    SF-ADJUSTMENT  _"# of vertical frames"  '(2 1 1024 1 10 0 1)
                    SF-TOGGLE      _"Generate LSL script?"  TRUE
                    SF-VALUE        _"Frames per second (for script):" "10.0")
</scheme>
 
New in this version with respect to the stable one:
 
* Add progress indicator.
* Clip each layer to its rectangle.
* Respect the original offsets of layers.
* Do the merge down in the correct order.
* Add alpha to the layers that lack it.
* Set the final layer's size to the image's size.
* Extensively commented.
* Generate the LSL script.
* Automatically remove alpha from the final image if not needed.
* Read the layer name to see if it includes the word "(combine)", and if so, combine it, as the ''Unoptimize'' filter does. With this change, ''Unoptimize'' should be unnecessary.


== TODO list ==
== TODO list ==

Latest revision as of 17:44, 21 December 2010

Development version

No changes with respect to the stable version yet.

TODO list

  • Perhaps change the strategy to use gimp-image-duplicate to simplify the process.
  • Add the opposite conversion: given an animated texture, split it into layers.
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